18-year-old writer Su Meng has written her first romance novel 'Give You My Heart'. In the novel, she created a villain named Mu Si Chen, who is smart and cunning.

One day, Mu Si Chen comes to her house and forces her to let him live with her. Mu Si Chen's arrival makes Su Meng's life miserable and changes everything in her life. Despite the many things that happened, Mu Si Chen is gradually moved by Su Meng's warm spirit, unexpectedly falling in love with her without realizing it.

十八线网文作家苏檬将自己的暗恋心事写成了小说《喂，给你我的小心心》，并为推动男女主情感创作了一个反派工具人极品嘴总慕司琛。某天慕司探突然出现在苏檬家中，苏檬在小说中给慕司琛的千奇百怪的设定都“反噬”到了自己身上，令苏檬苦不堪言。二人在鸡飞狗跳的生活中，渐漸发现了对方身上的温暖可爱，两颗心开始彼此靠近。一路上苏檬与“纸片人”慕司琛相互支持，共同成长，从互坑互怼走向了“真香”爱情。